THERMODYNAMIC PROPERTIES OF HELIUM AT LOW TEMPERATURES AND HIGH PRESSURES

摘要

This thesis is a compilation and correlation of the present data on the thermodynamic properties of helium below 20°K. The existing data were compared to the new data and the errors resolved by selection based on estimated accuracy, experimental apparatus, and technique of the investigator.nMethods of property diagram construction are also explained, and the results are presented in the form of temperature-entropy and enthalpy-entropy diagrams. Pressures to 100 atmospheres, temperatures from 0°K to 20° K and specific volumes from 5 liters/kgm. to 800 liters/kgm. are presented.